MIDI is the Musical Instrument Digital Interface.
The package contains definition of realtime and file MIDI messages,
reading and writing MIDI files,
and some definitions from the General MIDI standard.
It contains no sending and receiving of MIDI messages.
For this purpose see the alsa-seq, jack, PortMidi, hmidi packages.
For music composition with MIDI output, see haskore.
Alternative packages are HCodecs, zmidi-core.